Tube-boiler.



No. 681,746. Patented Sept. 3, MM.

L. SEBPOLLET.

TUBE BOILER.

(Application filed May 11, 1900) (No Model.)

m. segue. Patented Sept. 3', [90L L. SERPDLLET.

- TUBE BOILEB.

(Application filed. Hayll, 1900.) (No Modal.) 5 Sheets-Sheei 2.

(No Model.)

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m H 2% .L p a S d B .t .n .B t a P. l E L L U P R E S L 6 4 2 m 6 0 NTUBE BOILER. A lication filed ma 11, 1900.

5 Sheets Sheet 5.

(No Model.)

UNrrnn STATES PATENT LEON SERPOLLET, OF PARIS, FRANCE.

TUBE-BOILER.

SPECIFICATION forming part of Letters Patent No. 681,746, datedSeptember 3, 1901.

Application filed May 11, 1900.

To all whom it may concern.-

Be it known that I, LEON SnRPoLLnT, engineer, residing at Paris, France,have in Vented new and useful Improvements in and Connected withTube-Boilers,whichimprovements are fully set forth in the followingspecification.

The present invention relates to tubeboilers in which three groups ofbent and spiral-formed tubes, the side walls of which are of difierentthickness, are superposed in such a manner as to ascertain aninstantaneous evaporization of the water.

My invention will be fully understood with reference to the accompanyingdrawings, in which, as an example, I have illustrated a tube-boiler withthree groups of tubes bent in the particular form which hereinafter willbe described.

In the drawings, Figure 1 illustrates a plan view of a series composingthe upper group of tubes. Fig. 2 is a plan view of another series of thesame group of tubes. Fig. 3 is a plan view showing series illustrated inFigs. 1 and 2 when superposed. Fig. 4 is a plan View of the secondgroup, illustrating the general arrangement and the terminals. Fig. 5shows in plan view the third or lower group, the tubes being bentrectangularly. Fig. 6 is an elevation view of the preceding figure,showing the terminals of the tubes. Fig. 7 shows an elevation View ofthe whole boiler, composed of three groups of tubes. Fig. 8 is avertical section through line XI XI of Fig. 7. Fig. 9 is a transversesection through the axis of Fig. 7-viz., through line XII XII of Fig. 8.

In the rectangular box 20 surrounding the boiler and on the bottomthereof I have arranged the first group A of boiler-tubes, consisting ofseveral superposed series of spiralformed tubes communicating with thesecond group placed at the top of the first one. All of the tubes aresimilar to one another; but they are arranged in such manner that theiraxes never are superposed correctly. At the top of the second group B, Ihave arranged the third group C. These three groups are connected in amanner as to allow of a good circulation of the water. (See Figs. 7, 8,and 9.) In order to explain the construction of my Serial No. 16,350.(No model.)

boiler, I am going to describe the several groups separately.

The branches or spirals of the lower group A, Figs. 5, 6, 8, and 9,consist of a continuous tube, the exterior diameter of which is equal tothat of the tubes composing the groups B and C, but the side walls ofwhich are thicker, so that the interior diameter of the tubes of thegroup A is smaller than that of the tubes forming the groups B and O.The branches being bent rectangularly form side walls of the fire-box,in which I preferably arrange hydrocarbon-burners. The direction inwhich the water is circulating Within the tubes is illustrated byarrows.

The spiral-formed tubes composing the second group, Figs. 1, 8, and 9,are arranged at the top of the group A.

Above the group Bis placed the third group O, forming the upper part ofthe boiler and being the most important of the three groups. Fig. 9being a section through lines 4: 4:, 3 3 of Fig. 2 and 2 2, 1 1 of Fig.1 shows the arrangement of this group, which is composed of a greaternumber of tubes than the two lower groups A and B. Fig. 8 being asection through lines IV IV, III III of Fig. 2 and II II, I I of Fig. 1also shows the arrangement of the interchangeable tubes composing theupper group 0. As can be seen, the interior diameter of the tubescomposing the group C is greater than that of the tubes B and A. Inconsequence of this fact the bends at the extremities are larger thanthose of the tubes B, for instance.

The particular combination of the bent tubes communicating with oneanother and of the three groups superposed, the whole being inclosed ina box w, serving simultaneously as fire-box and as smoke-box, ascertainsan instantaneous evaporation of the water circulating within the saidtubes.

The Working of my improved tube-boiler is the following: The watercoming from a reservoir, pump, or the like enters the upper parts of theboiler at a, Figs. 7, 8, and 9, passes through the pipe I), descends inthe pipe 0, Fig. 7, enters the lower group of tubes A at d, andcirculates through said tubes, which have thick side walls. The run ofthe water is indicated by arrows. Arriving at the end of the tubes A thewater leaves this group at e and enters the two superposed groups B atf, leaves the first of these groups at g, and passing through shortpipes g f onters the second group at f, leaves the uppermost group B atg, and ascends in the tube h of the upper group 0, having more tubesthan the lower groups. The side walls of this upper group are thinner.Consequently their interior diameter is larger. The water then passesthrough the tubes h t' t" 70 70' Z Z m m n n 0 0'1) 19 r r s s t t andtransformed into steam leaves the boiler through the aperture u.

The group 0 consisting of a certain number of bent tubes connectedtogether it is easy to interchange them, if necessary. The diiferenttubes composing said group O are fixed in the following manner: Asclearly shown in Figs. 7 and 8, the front Wall. of box w is composed ofa plurality of overlapping plates 00, the ends of which extend a shortdistance beyond the side walls of the box.

' Lugs R on said side Walls project through corresponding openings inplates as, and pins S are passed through perforations in said lugsto'secure the plates 00 in place. The ends of the tubes constituting theseveral groups are each provided with a flange 3 (see Fig. 5 withreference to group A, for example,) adapted to bear against the innerface of plate 00, a square part y,adapted to engage a correspondingopening through the plate, and a screwthreaded extremity beyond saidsquare part adaptedto be engaged by a nut 1 Fig. 7, on one of the shortexterior pipe connections, (such as g f, Fig. 7, for example.) To removeany of the boiler-tubes, it suffices after disconnecting the shortoutside tube connections thereof to loosen the platex corresponding tosaid tube by removing pins S and then withdraw the plate andcorresponding coil of tube.

Having now fully described and ascertained the nature of my invention, Ideclare that what I claim is- 1. In a tubular boiler, a casing, threesuperposed groups of differently-arranged coils of tubes, the tubes ofall of the groups having the same exterior diameter, the upper groupbeing composed of a greater number of coils and tubes of larger interiordiameter than the lower groups.

2. In a tubular boiler, a casing, three superposed groups ofdifferently-arranged coils of tubes, the upper group being composed of agreater number of coils than the lower groups and the tubes composingsaid upper group being of different interior diameter from the tubescomposing the lower groups, removable supporting-plates in which theends of the tubes of the several groups are adapted to be secured, andremovable con necting-tubes through which the ends of the severalcoil-tubes communicate.

3. In a tubular boiler, a casing, a plurality of superposed coils oftubes, removable supporting-plates in which the ends of the tubes of theseveral groups are adapted to be secured, and removable connecting tubesthrough which the ends of the several coiltubes communicate.

4. In a tubular boiler, a casing, a series of tubes bent to rectangularform and surrounding the fire-box, a second series of tubes bent inspiral form placed above and connected with the first series of tubes, athird series of spirally-formed tubes superposed above each other in theform of a grate said series being placed above the second series andconnected therewith, substantially as described.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

LEON SERPOLLET. [L. s.]

Witnesses:

J. ALLISON BOWEN, DOMINIQUE CASLONG.

